Here’s how sex-change surgery relates to probability:
Me: Can anyone think of an example of something that absolutely we know it will not happen? Something whose probability would be zero.
Student: A boy cannot be a girl.
Me: Actually…
And thus commenced a brief and undetailed conversational tangent in which I attempted not to freak out the twelfth graders with the power of science. Then it was back to maths.
Me: So can you try to think of another example?
Student: A dead person cannot become alive.
Me: Sure.
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